Improvement in dental pluggers



specification, and to the letters and figures of NITED STATES PATENTOFFICE.

EDWARD S. RIDER, OF OATLETTSBURG, KENTUCKY.

IMPROVEMENT lN DENTAL PLUGGERS.

Specification forming part of Letters Patent No. 163,412, dated May 18,1875 application filed February 6, 1875.

To all whom it may concern:

Be it known that I, EDWARD S. RIDER, of Gatlettsburg, in the county ofBoyd and State of Kentucky, have invented anew and valuable Improvementin Dentists Mallets; and I do hereby declare that the following is afull, clear, and exact description of the construction and operation ofthe same, reference being bad to the annexed drawings, making a part ofthis reference marked thereon.

Figures 1 and 2 of the drawings are representations of vertical centralsections of my mallet, and Fig. Sis a plan view of the same.

This invention has relation to dentists mallets; and it consists incertain novel means for adjusting the anvil on the pull-and-push rod,andalso in the method of adjusting the tension of the spring thatoperates the hammer, as hereinafter more fully set forth and claimed. V

In the annexed drawings, A designates a tubular handle, in which worksthe rod B, to which the dental tools are attached. This rod B is allowedto receive endwise play through caps to b, which are screwed into theends of the tube A. The cap a is tubular, andincloses a spring, 0, whichis compressed between shoulders, and which, by its recoil, returns therod B to its place after each blow. The cap 1) receives looselythroughit a hollow stem, 0, one end of which is square, and in this stema square tube, d, is received, which is secured to a follower-screw, c,which latter is tapped into the handle A, and adjustable by turning thestem 0. The tube 61 receives through it the rod B, and on this rod, nextto the cap a, an anvil, e is rigidly secured. The anvil has a straightgroove, f, in its periphery, which receives the ends of screws 8 8, thuspreventin g the rod B and the anvil from turning. E designates acylindrical hammer, which is of less diameter than the bore of thehandle A, and through which passes loosely the rod B. This hammer E isgrooved longitudinally, and near one end of the groove a hole is madefor the purpose of receiving the beveled nose of a spring-catch, g, oneend of which is attached to the rod B, and the other end is acted on bya spring, 1 The catch ghas a beveled lip, 9 formed on it, which, whenbrought in. contact withatongue, h, will release the catch from thehammer, and allow a spring, S, between the hammer and the follower e,to'strike the anvil e and give the blow, after which the spring 0 willthrow back rod B and engage the hammer with its catch 9. When the blowsare to be given by the recoil of spring S, and the bit is inserted intothat end of rod B nearest the follower e, the operator draws this rodendwise until g strikes the tongue h, which will release the hammer Eand allow spring S to forcibly throw it against the anvil c, and thusgive the blow. If the bit is inserted into the opposite end of the rodB, the blows are given by tapping with the fingcr on this rod, thespring S in this case operating to retract the rod.

It will be seen that by means of the followerscrew 0, provided with thesquare tube 61, in connection with the square stem a, turning in thescrew-cap b, by revolving the stem 0, the follower-screw 0 can be raisedand lowered at pleasure, thereby increasing or decreasing the tension ofthe spring S, thus varying at will the blow of the hammer on the anvil.

What I claim as new, and desire to secure by Letters Patent, is- I 1. Inadentalplugger, the reciprocating rod B, adjustable anvil e, catch g,having lip 9 and springs 9 S, and 0, in combination with the groovedsliding hammer E and slotted tube A, having the tongue h, substantiallyas described, and for the purpose set forth.

2. The reciprocating rod B, carrying the sliding hammer E and spring S,in combination with the screw-follower 6, having square tube d, squarestem 0, and screw-cap 1), substantially as described, and for thepurpose set forth.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

EDWARD S. RIDER.

Witnesses:

J. H. MGOONNELL, W. H. HAMPTON.

